Mechanisms behind the successful invasion of American Bullfrogs (Rana catesbeiana) in the Northwest United States

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1 Mechanisms behind the successful invasion of American Bullfrogs (Rana catesbeiana) in the Northwest United States Tiffany Garcia, Rebbecca Hill, Sarah Abdulkarim, and Chris Funk Department of Fisheries and Wildlife

2 Invasive Species Pressing Ecological Question: What mechanisms allow exotic species to invade and establish in novel environments? European Starling American Beach Grass Nutria Himalayan Blackberry New Zealand Mudsnail Red Swamp Crayfish

3 Invasive Species Pressing Ecological Question: What mechanisms allow exotic species to invade and establish in novel environments? American Beach Grass Nutria Canary Reed Grass Feral Pig European Starling Yellow Star Thistle Sudden Oak Death Himalayan Blackberry Bullfrog New Zealand Mudsnail European Green Crab Red Swamp Crayfish

4 Bullfrog Background Information Native Range: Eastern North America Rana catesbeiana Distribution Invasive Range: Western North America Mechanism: Frog farms Pet release Photo:L.Morrison Photo:Corel Inc.

5 Bullfrog Background Information Invasion Impacts Invasive Bullfrogs can negatively impact native species Joseph M. Kiesecker et al. (2001) Adult bullfrogs reduce larval Red-legged growth rates and alter microhabitat choice Red-legged Frogs Context dependent: respond only when habitats are disturbed Mike Adams et al. (2003) Invasion of bullfrogs in the PacNW is facilitated by the presence of non-native fish Invasive Synergisms Non-native fish reduce predatory macroinvertebrate densities

6 Bullfrog Background Information Comparison of Life History Characteristics Relative Size Hydroperiod Larval Period Dispersal Rate Native Bullfrog Populations Medium Permanent Invasive Bullfrog Populations Large Ephemeral + Permanent mos 3-24 mos? >4km/yr 1. Preliminary hydroperiod data 2. Radio tag data

7 Hypotheses 3 hypotheses for successful establishment 1. Local adaptation to novel environment Phenotypic divergence is genetically based Invasive population has adapted to local conditions 2. Phenotypic plasticity in response to novel environmental conditions Phenotypic divergence is environmentally induced Individuals across populations can plastically adjust phenotype 3. Invasive acts as disease reservoir Invasive species are carriers of a pathogen The introduced disease decreases fitness of natives and facilitates the carrier s invasion

8 Predictive Model Question: Why are bullfrogs successful invaders? Hypotheses: Local Adaptation Phenotypic Plasticity Disease Reservoir Phenotypic differences in Common Garden Exp. No Phenotypic difference in Common Garden Exp. Bullfrogs can infect native amphibians with Bd Lab Predictions: Model Predictions: Time-lag in population establishment in novel habitats Wide distribution despite novel habitats Negative interactions of (Bd + BF) on native amphibian distributions Time 0 Time 1 Time 2 Time 0 Time 1 Native Range Native+(Bd+BF) Range Ground-truthing: Field Survey

9 Research Project Objective 1: Determine the source population(s) of invasive bullfrogs in the Pacific Northwest Methods: Use molecular markers to determine the geographic origin of source population(s) within the native range. mtdna markers microsatellite markers Austin et al. 2004

10 Bullfrog Tissue Collection Cat tail pond Turtle Flats Ankeny NWR E.E. Wilson Site #4

11 Results: Objective 1 Source Region: Michigan/Indiana/Ohio Haplotype mtdna analysis points to the Great Lakes bullfrog region microsatelite data will increase focus to population level Novel environmental Factors: temperature stability altered hydrological regimes limited temporal overlap w/natives facilitation by other invasives

12 Research Project Test Invasion Hypotheses: 1. Local Adaptation Temperature 2. Phenotypic Plasticity Hydroperiod 3. Disease Reservoir - Batrachochytrium dendrobatidis

13 Research Project Objective 2: Determine whether divergence in larval bullfrog phenotypes is genetically based Methods: Large-scale Common Garden Experiment Temperature (invasive/source) Hydroperiod (ephemeral/permanent) Quantify Phenotypic Divergence 1. Growth Rate 2. Time till Metamorphosis 3. Morphometrics OSU s Center for Disease Research

14 Research Project Objective 3: Test whether bullfrogs can infect native amphibians with Batrachochytrium dendrobatidis (Bd) Methods: Bd Exposure Experiment 1. Expose native individuals to infected bullfrog individuals 2. Quantify mortality 3. Quantify infection using PCR

15 Significance How do you stop bullfrog invasions? Depends. 1. Local adaptation Delayed expansion into novel environments Time to adapt management plans 2. Phenotypic plasticity Expansion only limited by dispersal speed Run for the hills! 3. Disease reservoir Bullfrog invasive range will have little/no overlap with native frogs Target the pathogen

16 Future Coqui? Survey range expansion Target adult females Seasonally drain ponds Send me tissue samples!!! Tiffany Garcia Dept. of Fisheries and Wildlife Oregon State University Corvallis, OR 97333

17 Acknowledgments Dave Paoletti Beth Hultman Becky Hill Chris Funk Phil Rossignol Randy Colvin Additional Field Assistants: Sarah Abdulkarim Scott, Selina & Dylan Heppell Rob Hultman Andy Blaustein

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